I built a website for comparing satellite images from ESA Copernicus Sentinel-2 of Southern California from before and during the January 2025 wildfires. The extent of the damage to vegetation and buildings is clearly visible from these images.<p>Although Copernicus Sentinel-2 data and tools are open and free to use via Copernicus Browser (<a href="https://browser.dataspace.copernicus.eu/" rel="nofollow">https://browser.dataspace.copernicus.eu/</a>), I hope that this website presents the data in a makes the data more accessible and easier to share with less technical users.<p>The web viewer was created using Leaflet and leaflet-compare. Other tools used include Microsoft Planetary Computer, PySTAC Client, Rasterio, and GDAL.<p>Related: This previous Show HN (<a href="https://news.ycombinator.com/item?id=42641530">https://news.ycombinator.com/item?id=42641530</a>) does something similar but with NOAA GOES instead.